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Comparative cyclic voltammograms of 0.25 mM compound 2 without (a), with (b) 0.25 mM sodium toluene-4-sulfinate and 0.25 mM sodium toluene-4-sulfinate (c) at a glassy-carbon electrode (S = π mm2) in aqueous solution (H2O:AN, 80:20), containing acetate buffer (pH =7, c = 0.2 M). Scan rate: 50 mV/s
